var a = new Map([['jiarang',80],['shushu',70]]);
console.log(a.get('jiarang'));

var b = new Map();
b.set('sa',22);  
b.set('sas',12);
console.log(b.has('sa')); 
console.log(b.get('sa'));
b.delete('sa'); 
console.log(b.get('sa'));

var c = new Map;
c.set('sa',2);
c.set('sa',3);
console.log(c.get('sa'));


var d = new Set([1,1,1,'1']);
console.log(d);

var e = new Set([1,2,3,4]);     
e.delete(3);
console.log(e);